HELP!!

A friend notices that a nail that was left outside for a few months seems larger and heavier than it was before. He says it disproves the law of conser- vation of mass. Explain why he is wrong

It's common for nails to be made of iron, which is a metal that rusts when it comes into contact with air. Exposure to the elements for a long time caused oxygen-iron reactions when there was moisture around. This caused a chemical reaction that made rust, which is made of iron oxide.
Here, the oxygen that mixed with the iron to make rust adds weight to the thing.

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HELP!!A friend notices that a nail that was left outside for a few months seems larger and heavier than it was before. He says it disproves the law of conser- vation of mass. Explain why he is wrong​

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HELP!!

A friend notices that a nail that was left outside for a few months seems larger and heavier than it was before. He says it disproves the law of conser- vation of mass. Explain why he is wrong